Yatarō Iwasaki founded the Mitsubishi company as a shipping firm under the name "Tsukumo Shokai".

The company's name was changed to Mitsubishi Shokai.

Mitsubishi acquired the Takashima Mine, expanding into coal mining to fuel its steamship fleet.

Mitsubishi bought Hashima Island to further support its coal mining operations for its steamship fleet.

Hisaya Iwasaki succeeded Yanosuke as president and began modernizing the Nagasaki Shipyard and developing Marunouchi as a business district.

Koyata Iwasaki succeeded Hisaya as president, leading to significant expansion of the group.

Koyata funded the establishment of an optics company, later known as Nikon, becoming its majority shareholder.

Mitsubishi's real estate holdings in Tokyo's Marunouchi district were spun off to create Mitsubishi Estate.

Mitsubishi Heavy Industries supplied ships, aircraft, and other arms during World War II, including the Mitsubishi A6M Zero fighter.

Mitsubishi Mining was involved in the forced labor of Allied prisoners of war and people from Japan's colonies and occupied territories during World War II.

Koyata Iwasaki gave a speech about serving the country during World War II, but also remembering obligations to people in Allied countries.

The Mitsubishi conglomerate underwent significant restructuring due to the Allied Occupation's policy to dissolve zaibatsu after World War II.

Two men attempted to take over Yowa Real Estate by becoming majority shareholders, leading to other Mitsubishi companies buying the shares from them at an inflated price.

The Mitsubishi Group began holding monthly executive meetings, which evolved into a venue for coordinating policy between group companies.

Mitsubishi Corporation was reformed after the dissolution of the zaibatsu.

The Mitsubishi Friday Club was established to foster camaraderie and information exchange among the chairpersons and presidents of major Mitsubishi companies.

Mitsubishi Heavy Industries remerged after the dissolution of the zaibatsu.

Mitsubishi companies established the Mitsubishi Foundation to commemorate the centennial anniversary of the founding of the first Mitsubishi company.

The Mitsubishi Group briefly dabbled in television, agreeing a deal with Westinghouse Broadcasting International to become the Japanese distribution representative.

Mitsubishi Materials (formerly Mitsubishi Mining) compensated Chinese laborers who were conscripted to the company during World War II and apologized to ex-American prisoners of war.